Crack Repair is something that all homeowners, construction
workers, safety personnel and others will have to deal
with at some point in time. The simple fact is that
all cement structures will crack.
Foundations and other
cement structures will often crack as a result of settling,
soil pressure, water
damage, drying shrinkage, thermal movement, or other
causes. As most homeowners know, basement wall fractures
are common and a fact of life. Most fractures are
minor and cause few problems. However, other fractures
can grow over time and cause structural integrity
or, more commonly, water leakage. If the fracture
is large or growing over time, simple injection techniques
are not an appropriate or lasting fix. Under these
circumstances, appropriate needs to stabilize the
fracture, i.e., prevent it from expanding and getting
larger. To accomplish this, reinforcement and stabilization
Concrete crack repair employing Carbon fibre Countersunk
Staples are designed
to transfer load away from the fracture, thus creating
a long-lasting fix.
There are 6 ways in which a cement
fracture in a below-grade poured wall generally moves:
due to lateral loading
Outward: due to shrinkage of soils
due to thermal changes
due to thermal changes, i.e. cold, wet, dry, etc.
due to differential loading
Combination: all of the above conditions, plus the added load of the structure
crack repair using a stabilization
system involves, after surface preparation,
a standard injection technique to fill
all voids with a specially formulated epoxy
After the voids are filled, staples are
installed across the fracture in a fashion
and dissipates both lateral and vertical
movement. Staple placement is critical
for proper fix and is usually engineered
the project plan. Staples are usually placed
no more than 24 inches apart for effective
When a fracture is
caused by differential loading (shear),
the fix is considered structural. The staples
in this case are crisscrossed at a 30 degree
angles that will load the carbon in tension,
allowing function in shear. The result
is not only a fracture fix, but restoration
of the structural integrity of the wall.
When carbon-fibre sheet staples are anchored
into the cement, fewer loads are exerted
on the weak surface substrate and transferred
into actual cement. This improves its entire
inter-workings with the material of choice.
Concrete crack repair
and stopping shifting walls with Carbon-fibre
is a proven application and technology
that works as well in your home as in commercial
buildings, bridges, mines, road surfaces,
and in any other applications where reinforcement
and reparation are need.
Repairing Minor Concrete Cracks and Holes
Here are some tips and suggestions on how to patch
and repair minor concrete flaws that are not structural.
You should not attempt to make a repair on any wall
that may be structural as you could further hinder
the structural integrity of the wall. Additionally,
if a concrete crack reappears after repair, then
there exist an underlying condition and the repair
should be done professionally and with reinforcement.
Hairline Cracks and Concrete Repair
1. You can repair
hairline cracks in concrete with grout made of Portland
cement and water, much
in the same way as
repairing a crack in drywall.
water to the cement to form a thick paste.
2. Thoroughly clean around and in the crack as much as possible and remove
all dust. After the crack has been cleaned,
moisten the concrete along the
hairline crack with water for several hours. Moistening the concrete prevents
it from drawing
the water from the grout, which may dry out the grout mixture.
Although the concrete should be damp, there should be no
standing water on
the surface when the grout is applied.
3. After the hairline crack has been cleaned and moistened, apply the grout
with a putty knife or pointing trowel, forcing the
grout into the crack as
much as possible. Smooth the hairline crack area off so it is level with the
4. Allow the repaired area to dry about two hours and then cover the area with
a piece of plastic sheeting or a board. Keep the
area covered for about five
days, lifting the covering each day to keep the area moist (sprinkle the area
with a little water).
5. If the hairline crack reappears, then the crack will require reinforcement
or the hairline crack will continue to expand.
Repairing larger Cracks and holes in Concrete
Larger cracks are generally structural,
starting out as hairline cracks and increasingly getting larger. Such cracks
should not be repaired as described
below as you may further compromise the structural integrity. However, if
you have a larger crack that is not structural, it may be repaired as described
1. Cracks larger than hairline cracks must generally be enlarged before
they can be satisfactorily repaired. Enlarge the crack
along its entire length
with a cold chisel and hammer. Make the crack wider at the bottom than at
the top (known as
undercutting) that helps to bond the new concrete
with the older concrete. The width and depth of the undercutting depends
size and length of the crack. Undercut the crack to a minimum depth of 1".
2. After the crack has been widened and thoroughly undercut, remove all loose
material and brush the area with a wire brush
to completely clean the area.
Do not over-clean as the rough surface created by the chiseling provides a
good bond for the
3. The concrete patch will generally hold better if a concrete adhesive is
used first. There are many types of concrete
adhesives available in most hardware
stores. Acrylic resin is one common type. Brush the adhesive into the undercut
and allow it to dry until it becomes tacky. If you do not use a cement
adhesive, thoroughly moisten the area to be patched.
Moistening the area prevents
the old concrete from absorbing all the moisture in the concrete patch. Although
it should be
moist, no water should be standing on the area where the patch
is to be applied. You can also prime the area with a thin,
creamy mixture of
Portland cement and water.
4. For small patching jobs, use a pre-mixed concrete patch. If you use ready-mix
concrete patch, all you need to add is water.
To mix your own concrete patch,
use one part Portland cement to two-and-a-half parts of fine, clean sand.
5. Force the mixture into the cutaway area with a pointing trowel. Be sure
to use enough pressure to force the patch mix into all
the cutaway areas in
6. Keep the area covered for about five days. Lift the cover once each day
to wet down the repaired area, permitting the new
concrete to cure correctly.
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